CN106957932A - The production method of two layers of oily wax Waterproof leather - Google Patents

Abstract

The invention relates to a production method of two-layer oil wax waterproof leather, which belongs to the technical field of leather. The production method of the two-layer oil-wax waterproof leather comprises the following steps: taking the two-layer leather blank, after drying, successively grinding the leather, first softening, spraying, rolling oil wax, rolling, second softening and spraying a hand feeling agent , to obtain the two-layer oil wax waterproof leather. The two-layer oil wax leather prepared by the present invention has excellent water resistance and wet rub resistance, and also has strong tear strength. In addition, according to the production method of the present invention, the two-layer oil wax leather has stronger oil resistance. Waxy and chromatic aberrations effectively enhance the antique effect of leather, and the scratch resistance of leather is better. Once scratches occur on the surface of the leather, they can disappear by themselves; the performance of the two-layer oil wax waterproof leather obtained by the present invention can be compared with that of The top layer of waxed leather is comparable.

Description

Production method of two-layer oil wax waterproof leather

technical field

The invention belongs to the technical field of leather, and in particular relates to a production method of two-layer oil wax waterproof leather.

Background technique

The commonly used two-layer leather base is generally formed by crushing the leftovers of the genuine leather and adding additives to re-bond them. It is slightly rougher and thicker than real leather, but still retains the properties of real leather. The most widely used split hides are cow split hides and pig split hides.

Cow split leather is generally reprocessed by chemical coating or transfer film, and the transfer film leather is poor in low temperature resistance and is prone to wrinkles at low temperatures. However, the performance of the cow split leather after chemical finishing treatment will be better, and there will be no obvious defects even after embossing. With the continuous development of leather technology, due to the stable price and quality of cow split leather and its good processing formability, it has gradually been used as high-grade leather, even comparable to the first layer of cowhide.

Oil wax leather is one of the more high-end leather materials at present. The existing oil wax leather is mostly made of top layer cowhide after dyeing, oiling and waxing. It has excellent softness, elasticity and water resistance, and the price is relatively expensive. , so researchers consider making oil wax leather with lower price two-layer cowhide, but there are still many shortcomings in the existing oil wax leather made of cow split leather blank: first, the waterproof effect of the leather material is poor, Wet rub resistance is not good; second, the sense of oily wax and color difference is insufficient, and the charm of oily waxy leather cannot be reflected; thirdly, once there is a scratch on the surface of the leather material, it is difficult to disappear, and the tear strength of the leather material is low . Therefore, it is very necessary to study the two-layer oil wax leather.

Contents of the invention

The purpose of the present invention is to solve the deficiencies in the prior art, and provide a kind of production method of two-layer oily wax waterproof leather, the two-layer oily wax leather produced by this method has excellent water resistance and wet rub resistance, oily and waxy feeling Strong, with a good antique effect.

The present invention adopts following technical scheme:

The production method of the two-layer oil wax waterproof leather comprises the following steps: taking the two-layer leather base, after drying, successively grinding the leather, first softening, spraying, rolling oil wax, rolling, second softening and spraying a hand feeling agent, That is, the two-layer oil wax waterproof leather is obtained.

Furthermore, the production method of the two-layer oil wax waterproof leather specifically includes the following steps: taking the two-layer leather base and drying it;

Grinding: Take the dried two-layer skin, grind the bottom and surface of the skin with gravel, and clean the skin after grinding;

One-time softening: put the leather base after grinding into the softening drum and soften for 50-60 minutes;

Spraying: In parts by mass, add 20-40 parts of acrylic resin to 150-200 parts of water, raise the temperature to 50-60°C, stir evenly, and spray the acrylic resin slurry on the surface of the skin after the first crushing;

Roller oil wax: heat the oil wax until it melts, heat the roller coater to 85-95°C, pour the oil wax into the roller coater, roll the sprayed skin twice, and dry overnight;

Rolling: Ironing the skin after rolling with oil and wax;

Second softening: place the rolled skin in a softening drum and soften for 2-5 minutes;

Spraying hand feeling agent: in parts by mass, 20-30 parts of leather hand feeling agent DH-9050 (can be purchased through Shandong Liaocheng Donghui Organic Silicon Chemical Co., Ltd.), 15-19 parts of hand feeling agent MELIO WF-5230 (Keep Ryan MELIO WF-5230, which can be purchased through Shanghai Shiran Chemical Co., Ltd.) Add 100-120 parts of water at 45-50°C, stir evenly, and spray the hand feeling agent slurry on the leather after the second crushing, After drying, the two-layer oil wax waterproof leather is obtained.

Further, the leather grinding is as follows: use 180 ^# and 220 ^# grits to grind the bottom surface of the leather base, use 280 ^# and 180 ^# grit to grind the surface of the leather base, and sweep the skin ash after grinding.

Furthermore, the acrylic resin used in the spraying is MELIO RESIN A-776 (ie, Melio resin A-776), and the amount of acrylic resin slurry used in the spraying is 20-30 grams per square meter of skin blank.

Furthermore, the amount of oil wax used when rolling the oil wax is 60-70 grams per square meter of leather.

Furthermore, the ratio of the rolling speed of the roller coating machine to the speed of the blanket is 30:10 when the oil wax is rolled.

Furthermore, the rolling burnishing is specifically to iron the leather base after rolling oil wax at 105°C and 40kg pressure.

Furthermore, when spraying the handle agent, the spraying amount of the handle agent slurry is 40-50 g/m2 leather base.

Furthermore, the split hide is cow split hide.

Compared with the prior art, the present invention has the beneficial effects as follows: the present invention selects cow split skins for drying, grinding, first softening, spraying, rolling oil wax, rolling, second softening and spraying hand feeling. agent and other process steps, through strict control of the process conditions of each step, combined with the use of excellent additives, the obtained two-layer oil wax leather has excellent water resistance and wet rub resistance, and also has strong tear resistance. strength, in addition, according to the production method of the present invention, the two-layer oil wax leather has a strong sense of oil wax and color difference, which effectively enhances the antique effect of the leather, and the scratch resistance of the leather is better. Scratches can disappear by themselves; the performance of the two-layer oil wax waterproof leather obtained by the present invention is comparable to that of the first layer oil wax leather.

detailed description

The present invention will be further described in detail below in conjunction with the examples.

Those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be considered as limiting the scope of the present invention. The acrylic resin used in the present invention is MELIO RESIN A-776-ID, Lot Nr: 3203000169. The reagent raw materials used in the present invention can be obtained by purchasing unless otherwise specified.

Example 1

The production method of two-layer oil wax waterproof leather comprises the steps:

Take the cow split hide and dry it;

Grinding: take the dried two-layer leather, use 180# and 220# gravel to grind the bottom surface of the leather, use 280# and 180 ^# to grind the surface of the leather, and sweep the leather after grinding;

One-time softening: put the leather base after grinding into the softening drum and soften for 60 minutes;

Spraying: In parts by mass, add 30 parts of acrylic resin MELIO RESIN A-776 to 180 parts of water, raise the temperature to 55°C, stir evenly, spray the acrylic resin slurry on the surface of the skin that has been softened once above, and spray When the acrylic resin slurry consumption is 25 grams per square meter of skin blank.

Roller oil wax: heat the oil wax until it melts, heat the roller coater to 90°C, pour the oil wax into the roller coater, set the rolling speed and blanket speed ratio to 30:10, roll the sprayed skin Apply twice, dry overnight, the amount of oil wax is 65 grams per square meter of leather;

Rolling: iron the skin after rolling oil wax at 105°C and 40kg pressure.

Secondary softening: place the rolled skin in a softening drum and soften for 2 minutes;

Spraying hand feeling agent: in parts by mass, add 25 parts of leather hand feeling agent DH-9050 and 18 parts of hand feeling agent MELIO WF-5230 into 110 parts of water at 50°C, stir evenly, and spray the hand feeling agent slurry until the second time On the skin base after falling soft, spraying amount is 45 grams/square meter skin base, obtains described two-layer oily wax waterproof leather after drying.

Example 2

The production method of two-layer oil wax waterproof leather comprises the steps:

Take the cow split hide and dry it;

Grinding: take the dried two-layer leather, use 180# and 220# gravel to grind the bottom surface of the leather, use 280# and 180 ^# to grind the surface of the leather, and sweep the leather after grinding;

One-time softening: put the leather base after grinding into the softening drum and soften for 55 minutes;

Spraying: In parts by mass, add 20 parts of acrylic resin MELIO RESIN A-776 to 150 parts of water, raise the temperature to 50°C, stir evenly, spray the acrylic resin slurry on the surface of the skin that has been softened once above, and spray When the acrylic resin slurry consumption is 20 grams per square meter of skin blank.

Roller oil wax: heat the oil wax until it melts, heat the roller coater to 85°C, pour the oil wax into the roller coater, set the rolling speed and blanket speed ratio to 30:10, roll the sprayed skin Apply twice, dry overnight, the amount of oil wax is 60 grams per square meter of leather;

Rolling: iron the skin after rolling oil wax at 105°C and 40kg pressure.

Secondary softening: place the rolled skin in a softening drum and soften for 4 minutes;

Spraying hand feeling agent: in parts by mass, add 20 parts of leather hand feeling agent DH-9050 and 15 parts of hand feeling agent MELIO WF-5230 into 100 parts of water at 45°C, stir evenly, and spray the hand feeling agent slurry until the second time On the leather base after falling soft, the spraying amount is 40 grams per square meter of leather base, and promptly obtains described two-layer oily wax waterproof leather after drying.

Example 3

The production method of two-layer oil wax waterproof leather comprises the steps:

Take the cow split hide and dry it;

Grinding: take the dried two-layer leather, use 180# and 220# gravel to grind the bottom surface of the leather, use 280# and 180 ^# to grind the surface of the leather, and sweep the leather after grinding;

One-time softening: put the leather base after grinding into the softening drum and soften for 50 minutes;

Spraying: In parts by mass, add 40 parts of acrylic resin MELIO RESIN A-776 to 200 parts of water, raise the temperature to 60°C, stir evenly, spray the acrylic resin slurry on the surface of the skin that has been softened once above, and spray When the acrylic resin size usage is 30 grams per square meter of skin blank.

Roller oil wax: heat the oil wax until it melts, heat the roller coater to 95°C, pour the oil wax into the roller coater, set the rolling speed and blanket speed ratio to 30:10, and roll the sprayed skin Apply twice, dry overnight, the amount of oil wax is 70 grams per square meter of leather;

Rolling: iron the skin after rolling oil wax at 105°C and 40kg pressure.

Secondary softening: place the rolled skin in a softening drum and soften for 5 minutes;

Spraying hand feeling agent: in parts by mass, add 30 parts of leather hand feeling agent DH-9050 and 19 parts of hand feeling agent MELIO WF-5230 into 120 parts of water at 50°C, stir evenly, and spray the hand feeling agent slurry until the second On the leather base after falling soft, spraying amount is 50 grams/square meter leather base, promptly obtains described two-layer oily wax waterproof leather after drying.

Comparative example 1

The difference between this comparative example and Example 1 is: the oily wax is directly rolled after falling soft once, and only a single commercially available oily wax leather handfeel is sprayed when spraying the handfeeling agent.

Comparative example 2

This comparative example is a commercially available two-layer oil wax cowhide.

Comparative example 3

This comparative example is a commercially available top layer oil wax cowhide.

Carry out performance test to the leather that the embodiment 1 to 3 of the present invention and comparative example 1 make, the leather of comparative example 2 and 3, scratch resistance self-test method is: use finger to scratch on leather material surface, record scratch disappear time , the shorter the time, the better the scratch resistance, the results are shown in Table 1 below:

Table 1 Performance Test

It can be seen from the above table that the two-layer oil wax waterproof leather produced by the production method of the present invention has better performance, especially excellent water resistance, and its performance can be comparable to that of the commercially available top layer oil wax cowhide.

Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. the production method of two layers of oily wax Waterproof leather, it is characterised in that comprise the following steps：Take double-layer fur base, after drying according to It is secondary through buffing, once fall soft, spraying, the oily wax of roller coating, tumbling, it is secondary fall soft and spraying hand feeling agent, produce described two layers oily wax and prevent Water leather.

2. the production method of two layers according to claim 1 oily wax Waterproof leather, it is characterised in that specifically include following step Suddenly：

Double-layer fur base is taken, is dried；

Buffing：Dried double-layer fur base is taken, skin base bottom surface and surface is ground respectively with gravel, skin ash is cleaned after having ground；

Once fall soft：Skin base after buffing is placed in fall soft 50-60min is fallen in soft drum；

Spraying：According to the mass fraction, 20-40 parts of acrylic resin is added in 150-200 parts of water, is warming up to 50-60 DEG C, stirs Mix uniform, by acrylic resin syrup be sprayed into it is above-mentioned once fall it is soft after skin base surface；

Roller coating oil wax：Oily wax is heated to melt, coating roller is warming up to 85-95 DEG C, oily wax poured into coating roller, after spraying The roller coating of skin base twice, drying is stayed overnight；

Tumbling：By the skin base ironing after the oily wax of roller coating；

It is secondary to fall soft：Skin base after tumbling is placed in fall soft 2-5min is fallen in soft drum；

Spray hand feeling agent：According to the mass fraction, by DH-9050,15-19 parts of hand feeling agent MELIO WF- of 20-30 parts of Feeling Agents for Leather 5230 add in 100-120 parts 45-50 DEG C of water, after stirring, by hand feeling agent slurry be sprayed into through it is secondary fall it is soft after skin On base, described two layers oily wax Waterproof leather are produced after drying.

3. the production method of two layers according to claim 2 oily wax Waterproof leather, it is characterised in that the buffing is specific For：With 180^#With 220^#Gravel mill skin base bottom surface, with 280^#With 180^#Gravel mill skin base surface, sweeps skin ash after having ground.

4. the production method of two layers according to claim 2 oily wax Waterproof leather, it is characterised in that third used during spraying Olefin(e) acid resin is MELIO RESIN A-776, and acrylic resin syrup usage amount is 20-30 grams/m of skin base during spraying.

5. the production method of two layers according to claim 2 oily wax Waterproof leather, it is characterised in that during the roller coating oil wax The consumption of oily wax is 60-70 grams/m of skin base.

6. the production method of two layers according to claim 2 oily wax Waterproof leather, it is characterised in that during the roller coating oil wax Coating roller rolling speed and blanket speed are than being 30：10.

7. the production method of two layers of oily wax Waterproof leather according to claim 2, it is characterised in that the tumbling is specially By the skin base after the oily wax of roller coating in ironing under 105 DEG C, 40kg pressure.

8. the production method of two layers according to claim 2 oily wax Waterproof leather, it is characterised in that during spraying hand feeling agent, The quantity for spray of the hand feeling agent slurry is 40-50 grams/m of skin base.

9. the production method of two layers of oily wax Waterproof leather according to any one of claim 1 to 8, it is characterised in that described Double-layer fur base is cow split skin base.